Volcanogenic massive sulphide (VMS) deposit. Total resources: 24.7 Mt of ore @ 4.09 % Zn and 1.92 % Pb.
Stratabound, distal Zn-Pb skarn deposit (more likely than VMS)
Tens of stratabound Zn-Pb orebodies of varying sizes have been identified at Fengyan. Recent deep drilling revealed the concealed porphyry Mo mineralization beneath the current Fengyan Zn-Pb mine. The Mo orebodies are hosted by moyite and granite porphyry, or filled in fracture zones of the Longbeixi Formation chlorite (-epidote) quartz schist. 31 strata-like orebodies hosted by the pyroxene-epidote-rich calc-silicate rock in and/or around marble or quartz-mica schist of the Longbeixi Formation. The orebody Zn-5 is the major Zn orebody with an average Zn grade of 7.19 %.

The Fengyan mining area exposes a stratigraphic sequence from oldest to youngest as follows: (1) Meso-Neoproterozoic Longbeixi Formation, primarily composed of marble and quartz-mica schist, distributed in the central and southwestern parts of the mining area. This formation serves as the main host rock for the Zn-Pb orebodies; (2) Neoproterozoic Daling Formation, consisting mainly of phyllite, mica schist, and metamorphosed quartz sandstone; (3) Lower Jurassic Lishan Formation, dominated by carbonaceous shale, sandstone, and fine-grained quartz sandstone, located in the northeastern part of the mining area; (4) Upper Jurassic Changlin and Nanyuan Formations, composed of sedimentary clastic rocks, calc-alkaline extrusive rocks, and pyroclastic rocks, situated in the northwest and southeast parts of the mining area, respectively, hosting minor Zn-Pb orebodies; and (5) Quaternary sediments, sporadically distributed within the mining area. Nearly 40 Zn-Pb orebodies of varying sizes have been identified at Fengyan. These orebodies generally strike NE, dip NW, with dip angles ranging from 8° to 30°. They typically occur as lenses within interlayer skarn between marble and quartz-mica schist of the Meso-Neoproterozoic Longbeixi Formation. Most of orebodies show discrete spatial distribution, whereas a few individual orebodies are large-scale and continuous. Additionally, concealed porphyry Mo orebodies have been intersected at depth within the mining area.
The mineralization at the Fengyan deposit is divided into four stages:
Prograde skarn stage (I): Characterized by the formation of abundant pyroxene, minor garnet, and rhodonite.
Retrograde skarn stage (II): Dominated by the formation of hydrous silicates (epidote, chlorite, actinolite, and ilvaite) and iron oxides (e.g., magnetite, hematite).
Quartz-sulfide stage (III): This is the principal ore-forming stage at Fengyan, marked by abundant sulfides and quartz, accompanied by minor calcite.
Quartz-calcite stage (Ⅳ): Defined by the formation of quartz-calcite veins that crosscut the Zn-Pb orebodies and their host rocks, representing the latest hydrothermal event.

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References